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-rw-r--r--macros/luatex/latex/lua-ul/lua-ul.dtx55
1 files changed, 49 insertions, 6 deletions
diff --git a/macros/luatex/latex/lua-ul/lua-ul.dtx b/macros/luatex/latex/lua-ul/lua-ul.dtx
index b4c33d7b13..14aa2fae0a 100644
--- a/macros/luatex/latex/lua-ul/lua-ul.dtx
+++ b/macros/luatex/latex/lua-ul/lua-ul.dtx
@@ -335,9 +335,11 @@ local set_lua = token.set_lua
local scan_keyword = token.scan_keyword
local scan_list = token.scan_list
local scan_int = token.scan_int
+local scan_toks = token.scan_toks
local put_next = token.put_next
local texerror = tex.error
+local functions = lua.get_functions_table()
local char_given = token.command_id'char_given'
local underlineattrs = {}
@@ -355,6 +357,48 @@ local vmode do
end
local texnest = tex.nest
+% \end{macrocode}
+% \changes{0.1.0}{2020-07-13}{Ensure that \texttt{\string\everyhbox} doesn't interfere with hlist scanning}
+% To avoid influence from \texttt{\string\everyhbox} we reset \texttt{\string\everyhbox} to an empty token list directly before scanning.
+% As an added complication, we need to use a name which is guaranteed to be the primitive tokenlist and we
+% might have to restore it before reading the actual argument (There might be a reason why \texttt{\string\everyhbox} was sat after all.
+% Also we have to ensure that braces swallowed by LuaTeX are balanced, otherwise we get hard to trace errors in alignment contexts.
+% \begin{macrocode}
+local scan_raw_hlist do
+ local create = token.create
+ local lbrace, rbrace = token.new(0x7B, 1), token.new(0x7D, 2)
+ tex.enableprimitives('luaul@', {'everyhbox'})
+ local set_everyhbox do
+ local set_toks1, set_toks2 = {create'immediateassignment',
+ create'luaul@everyhbox', lbrace},
+ {rbrace, create'relax'}
+ function set_everyhbox(t)
+ token.put_next(set_toks2)
+ token.put_next(t)
+ token.put_next(set_toks1)
+ token.scan_token()
+ end
+ end
+ local func = luatexbase.new_luafunction"luaul.restore_everyhbox"
+ local everyhbox_saved
+ functions[func] = function() set_everyhbox(everyhbox_saved) end
+ local toks = {rbrace, -- Housekeeping, only for balance reasons
+ lbrace, create'the', create'luaul@everyhbox', rbrace,
+ create'hpack', lbrace,
+ token.new(func, token.command_id'lua_call')}
+ function scan_raw_hlist()
+ assert(token.get_next().command == 1)
+ put_next(toks)
+ token.get_next() -- Scan a corresponding brace to keep TeX's brace tracking happy
+ local saved_toks = scan_toks(false, true)
+ everyhbox_saved = saved_toks
+ set_everyhbox{}
+ local list = scan_list()
+ set_everyhbox(saved_toks)
+ return list
+ end
+end
+
local saved_values = {}
local function new_underline_type()
for i=1,#underlineattrs do
@@ -364,7 +408,7 @@ local function new_underline_type()
end
local strict_flag = scan_keyword'strict'
local over_flag = scan_keyword'over'
- local b = todirect(scan_list())
+ local b = todirect(scan_raw_hlist())
for i=1,#underlineattrs do
tex.attribute[underlineattrs[i]] = saved_values[i]
end
@@ -457,7 +501,6 @@ local function reset_underline()
end
tex.attribute[j] = -0x7FFFFFFF
end
-local functions = lua.get_functions_table()
local new_underline_type_func =
luatexbase.new_luafunction"luaul.new_underline_type"
local set_underline_func =
@@ -748,7 +791,7 @@ luatexbase.add_to_callback('vpack_filter',
\NeedsTeXFormat{LaTeX2e}
\ProvidesPackage
{lua-ul}
- [2020/03/31 v0.0.4 Underlining and related functionality for LuaTeX]
+ [2020/07/13 v0.1.0 Underlining and related functionality for LuaTeX]
% \fi
% Only \LuaLaTeX{} is supported.
@@ -762,7 +805,7 @@ luatexbase.add_to_callback('vpack_filter',
\directlua{require'lua-ul'}
\RequirePackage{xparse}
% \end{macrocode}
-% We support some options. Especially \verb+minimal+ will disable the predefined commands \verb+\underLine+ and \verb+\strikeThrough+ and allow you to define similar commands with your custom settings instead, \verb+soul+ tries to replicate names of the \verb soul package.
+% We support some options. Especially \verb+minimal+ will disable the predefined commands \verb+\underLine+ and \verb+\strikeThrough+ and allow you to define similar commands with your custom settings instead, \verb+soul+ tries to replicate names of the \verb+soul+ package.
% \begin{macrocode}
\newif\ifluaul@predefined
\newif\ifluaul@soulnames
@@ -802,7 +845,7 @@ luatexbase.add_to_callback('vpack_filter',
\expandafter\luaul@maybedefineuse
\expanded{{\csstring#2@@#3}}%
{\LuaULSetUnderline
- \LuaULNewUnderlineType#1\hbox{#4\hskip0pt}%
+ \LuaULNewUnderlineType#1{#4\hskip0pt}%
}}%
}
\ifluaul@predefined
@@ -818,7 +861,7 @@ luatexbase.add_to_callback('vpack_filter',
\def\luaul@@setcolor\xcolor@#1#2{}
\newcommand\luaul@setcolor[1]{%
\ifx\XC@getcolor\undefined
- \def\luaul@highlight@currentcolor{#1}
+ \def\luaul@highlight@currentcolor{#1}%
\else
\begingroup
\XC@getcolor{#1}\luaul@tmpcolor